From aebec990e0739c6209ab78f5a50aa1a6b47c8156 Mon Sep 17 00:00:00 2001
From: Edwin Jakobs <edwin@rndr.studio>
Date: Tue, 19 Aug 2025 13:54:55 +0200
Subject: [PATCH] [orx-fx] Add wrap mode support to ApproximateGaussianBlur and
 demo

---
 .../kotlin/blur/ApproximateGaussianBlur.kt    | 17 ++++++++++
 .../kotlin/DemoApproximateGaussianBlur01.kt   | 31 +++++++++++++++++++
 .../glsl/blur/approximate-gaussian-blur.frag  | 10 ++++++
 3 files changed, 58 insertions(+)
 create mode 100644 orx-fx/src/jvmDemo/kotlin/DemoApproximateGaussianBlur01.kt

diff --git a/orx-fx/src/commonMain/kotlin/blur/ApproximateGaussianBlur.kt b/orx-fx/src/commonMain/kotlin/blur/ApproximateGaussianBlur.kt
index 8f67b203..b2fe5fae 100644
--- a/orx-fx/src/commonMain/kotlin/blur/ApproximateGaussianBlur.kt
+++ b/orx-fx/src/commonMain/kotlin/blur/ApproximateGaussianBlur.kt
@@ -6,6 +6,7 @@ import org.openrndr.draw.*
 import org.openrndr.extra.fx.ColorBufferDescription
 import org.openrndr.extra.fx.fx_approximate_gaussian_blur
 import org.openrndr.extra.fx.mppFilterShader
+import org.openrndr.extra.parameters.BooleanParameter
 import org.openrndr.extra.parameters.Description
 import org.openrndr.extra.parameters.DoubleParameter
 import org.openrndr.extra.parameters.IntParameter
@@ -18,6 +19,14 @@ import org.openrndr.shape.Rectangle
  */
 @Description("Approximate Gaussian blur")
 class ApproximateGaussianBlur : Filter1to1(mppFilterShader(fx_approximate_gaussian_blur, "approximate gaussian blur")) {
+
+    @BooleanParameter("wrap u")
+    var wrapU = false
+
+    @BooleanParameter("wrap v")
+    var wrapV = false
+
+
     /**
      * blur sample window, default value is 5
      */
@@ -58,6 +67,8 @@ class ApproximateGaussianBlur : Filter1to1(mppFilterShader(fx_approximate_gaussi
         }
 
         intermediate.let {
+            parameters["wrapU"] = if (wrapU) 1 else 0
+            parameters["wrapV"] = if (wrapV) 1 else 0
             parameters["blurDirection"] = Vector2(1.0, 0.0)
             super.apply(source, arrayOf(it), clip)
 
@@ -65,4 +76,10 @@ class ApproximateGaussianBlur : Filter1to1(mppFilterShader(fx_approximate_gaussi
             super.apply(arrayOf(it), target, clip)
         }
     }
+
+    override fun close() {
+        intermediateCache.values.forEach { it.close() }
+        intermediateCache.clear()
+        super.close()
+    }
 }
\ No newline at end of file
diff --git a/orx-fx/src/jvmDemo/kotlin/DemoApproximateGaussianBlur01.kt b/orx-fx/src/jvmDemo/kotlin/DemoApproximateGaussianBlur01.kt
new file mode 100644
index 00000000..bac12fef
--- /dev/null
+++ b/orx-fx/src/jvmDemo/kotlin/DemoApproximateGaussianBlur01.kt
@@ -0,0 +1,31 @@
+import org.openrndr.application
+import org.openrndr.draw.createEquivalent
+import org.openrndr.draw.loadImage
+import org.openrndr.extra.fx.blur.ApproximateGaussianBlur
+import org.openrndr.extra.imageFit.imageFit
+
+fun main() = application {
+    configure {
+        width = 720
+        height = 720
+    }
+    program {
+        val image = loadImage("demo-data/images/image-001.png")
+        val blurred = image.createEquivalent()
+        val blur = ApproximateGaussianBlur()
+
+        var enableWrap = false
+
+        mouse.buttonDown.listen {
+            enableWrap = !enableWrap
+        }
+        extend {
+            blur.wrapU = enableWrap
+            blur.wrapV = enableWrap
+            blur.sigma = 15.0
+            blur.window = 15
+            blur.apply(image, blurred)
+            drawer.imageFit(blurred, drawer.bounds)
+        }
+    }
+}
\ No newline at end of file
diff --git a/orx-fx/src/shaders/glsl/blur/approximate-gaussian-blur.frag b/orx-fx/src/shaders/glsl/blur/approximate-gaussian-blur.frag
index 8bd52737..d4b7562f 100644
--- a/orx-fx/src/shaders/glsl/blur/approximate-gaussian-blur.frag
+++ b/orx-fx/src/shaders/glsl/blur/approximate-gaussian-blur.frag
@@ -6,6 +6,8 @@ uniform int window;
 uniform float sigma;
 uniform float spread;
 uniform float gain;
+uniform int wrapU;
+uniform int wrapV;
 
 uniform int sourceLevel;
 
@@ -19,6 +21,14 @@ void main() {
     for (int x = -w; x <= w; ++x) {
         float lw = exp( float(-(x*x)) / (2.0 * sigma * sigma) ) ;
         vec2 tc = v_texCoord0 + float(x) * blurDirection * s;// * spread;
+
+        if (wrapU != 0) {
+            tc.x = mod(tc.x, 1.0);
+        }
+        if (wrapV != 0) {
+            tc.y = mod(tc.y, 1.0);
+        }
+
         sum += texture(tex0, tc) * lw;
         weight += lw;
     }